Playing for Change is one of my favorite websites. Their mission is to connect the world through music, and they are doing just that. This is one of my favorites:

In 2011, Playing For Change joined forces with the United Nations Population Fund and the Millennium Development Goals Achievement Fund for UNPF’s 7 Billion Actions campaign. By the end of that year, the world population reached 7 billion, and this global campaign strove to bring awareness to the opportunities and challenges that the population growth would present. 7 billion people means 7 billion hearts, and music has always been the best way to speak to the hearts of the people. We traveled across the globe, put headphones on musicians, added them to the track, and created “United,” which serves as a tangible example of something positive we can all do together as a human race.